untreated
adjective
un·treat·ed
ˌən-ˈtrē-təd 
: not treated
untreated wastewater
especially
: not improved or controlled medically
an untreated case of pneumonia
untreated diabetic patients
Examples of untreated in a Sentence
untreated wool
Recent Examples on the Web
An untreated fungal infection in your nails, for instance, can be highly contagious and spread to other parts of your skin, says Lipner.
—
Andee Tagle, NPR, 21 Feb. 2026
Slate roofing and commercial rubber roofing are particularly susceptible to ice dams, which can lead to costly repairs and even roof replacements if left untreated.
—Asia London Palomba, The Spruce, 20 Feb. 2026
Also many incidents start as untreated mental health issues.
—Charlotte Observer, 20 Feb. 2026
Urinary tract infections, for example, can lead to premature labor and even sepsis if they’re left untreated.
—Erika Edwards, NBC news, 19 Feb. 2026
See All Example Sentences for untreated
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Andee Tagle, NPR, 21 Feb. 2026
Slate roofing and commercial rubber roofing are particularly susceptible to ice dams, which can lead to costly repairs and even roof replacements if left untreated.
—Asia London Palomba, The Spruce, 20 Feb. 2026
Also many incidents start as untreated mental health issues.
—Charlotte Observer, 20 Feb. 2026
Urinary tract infections, for example, can lead to premature labor and even sepsis if they’re left untreated.
—Erika Edwards, NBC news, 19 Feb. 2026
See All Example Sentences for untreated
Cite this Entry
“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 27 Feb. 2026.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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